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<p>Corrosion characteristics of Scalmalloy 3D printed in sulfate–chloride environments at high temperatures (250 and 350&#xa0;°C) are studied here to determine its strength for high-performance usage. Two corrosive solutions, V<sub>2</sub>SO<sub>4</sub> (60%)+NaCl (40%) and Na<sub>2</sub>SO<sub>4</sub> (50%)+NaCl (50%), were used to corrode the alloy for 72 hours, and weight loss measurement was taken as an important sign of material degradation. The total weight loss at 250&#xa0;°C was 0.01938&#xa0;g in the case of V<sub>2</sub>SO<sub>4</sub>+NaCl and 0.06418&#xa0;g in the case of Na<sub>2</sub>SO<sub>4</sub>+NaCl, whereas at 350&#xa0;°C it was 0.05609&#xa0;g and 0.03060&#xa0;g, respectively. The higher weight loss at higher temperatures signifies the increased breakdown of the protective oxide layer due to the dissociation of V<sub>2</sub>SO<sub>4</sub> with the evolution of SO<sub>2</sub> gas and enhanced sulfidation. Widespread surface deterioration was observed with Scanning Electron Microscopy, while energy-dispersive x-ray analysis confirmed the presence of Al, Fe, O, Na, and Cl, a reaction between the alloy and the corrosive environment. To prevent corrosion and to ensure good long-term behavior of 3D-printed Scalmalloy under harsh environments, advanced coatings or alloy optimization can be used.</p>

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High-Temperature Corrosion Behavior of 3D-Printed Scalmalloy in Sulfate-Chloride Environments

  • 期刊论文

  • 发表日期：

    2025年8月26日

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  • B. R. Senthilkumar,
  • S. Senthil Kumar,
  • R. Yokeswaran,
  • T. S. Senthilkumar

摘要

Corrosion characteristics of Scalmalloy 3D printed in sulfate–chloride environments at high temperatures (250 and 350 °C) are studied here to determine its strength for high-performance usage. Two corrosive solutions, V2SO4 (60%)+NaCl (40%) and Na2SO4 (50%)+NaCl (50%), were used to corrode the alloy for 72 hours, and weight loss measurement was taken as an important sign of material degradation. The total weight loss at 250 °C was 0.01938 g in the case of V2SO4+NaCl and 0.06418 g in the case of Na2SO4+NaCl, whereas at 350 °C it was 0.05609 g and 0.03060 g, respectively. The higher weight loss at higher temperatures signifies the increased breakdown of the protective oxide layer due to the dissociation of V2SO4 with the evolution of SO2 gas and enhanced sulfidation. Widespread surface deterioration was observed with Scanning Electron Microscopy, while energy-dispersive x-ray analysis confirmed the presence of Al, Fe, O, Na, and Cl, a reaction between the alloy and the corrosive environment. To prevent corrosion and to ensure good long-term behavior of 3D-printed Scalmalloy under harsh environments, advanced coatings or alloy optimization can be used.